Related Experiment Video

Updated: Aug 19, 2026

Determining the Reactivity and Titre of Serum using a Haemagglutination Assay
05:59

Determining the Reactivity and Titre of Serum using a Haemagglutination Assay

Published on: January 29, 2010

Involvement of complement and RA factor in non-specific agglutination of the latex reagent for HAA

S Martin-Sosa, R Berron

    Developments in Biological Standardization
    |January 1, 1975
    PubMed

    Heat inactivation of fresh sera reduced significantly the proportion of false-positive reactions when the latex agglutination test for the detection of HAA was used in a series of 454 sera, possibly because heating destroys the C'lq fraction of complement. Non-specific agglutination also occurred if RA factor was present in sera tested, a fact that has been previously reported. This rapid and simple test may be very convenient as a screening procedure, but all positive sera should be tested again by means of a more specific method, as well as for RA factor. Improvement of the reagent may result in the elimination of false-negative results, which were no-observed in this study but have been reported by others.

    More Related Videos

    Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells06:29

    Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells

    Published on: January 29, 2014

    Capsular Serotyping of Streptococcus pneumoniae by Latex Agglutination09:11

    Capsular Serotyping of Streptococcus pneumoniae by Latex Agglutination

    Published on: September 25, 2014

    Related Concept Videos

    Cross-reactivity00:42

    Cross-reactivity

    Overview
    Antigens Involved in Adaptive Immunity01:26

    Antigens Involved in Adaptive Immunity

    An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
    Complete Antigens
    Complete antigens possess both immunogenicity and reactivity.
    Antibody Actions01:26

    Antibody Actions

    Antibodies, or immunoglobulins, are critical players in the immune system's arsenal against invading pathogens. Produced by B cells and plasma cells, their primary role is to detect and bind to specific antigens, molecules found on the surface of pathogens like bacteria or viruses. Beyond antigen recognition, antibodies perform several vital functions that contribute to immune defense.
    Neutralization
    Antibodies can bind to pathogens, preventing them from infecting host cells. This process...
    Complement System01:27

    Complement System

    The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a membrane...
    Hypersensitivity Reactions: Cytolytic Reactions01:01

    Hypersensitivity Reactions: Cytolytic Reactions

    Type II hypersensitivity involves IgG and IgM antibodies targeting cell surface antigens, leading to cell destruction. This can occur through complement activation, antibody-dependent cell-mediated cytotoxicity (ADCC), or acting as opsonins for phagocytosis. When excessive, these reactions cause significant tissue damage.Drug-induced hemolytic anemia is a common example, where drugs like penicillin or cephalosporins bind to red blood cells, forming drug-protein complexes. These complexes...
    Hypersensitivity Reactions: Immune-Complex Reactions01:19

    Hypersensitivity Reactions: Immune-Complex Reactions

    Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum sickness, a systemic...